"Steve W." wrote:

Why don't you have an electrician wire the plug?

Here's a hint the black (hot line) and white (hot line) wires go to the
blades on the plug. Green is the ground/neutral wire in a three wire 220
plug. It goes to the round pin.

Personally I switched the power lead on mine to a four wire feed and
grounded it properly.

How the heck do you "properly" ground a 220v welder by switching to a
four wire cordset?

A four wire cordset only adds a neutral to your two hot and one ground
conductor and a 220v welder doesn't use a neutral. The welder comes with
a 3 wire cordset because that is all it uses. It's not like a clothes
dryer where there is a small 120v load which used to be allowed to be
carried on the ground and now requires a proper 4 wire feed.

Pete C.